1 /* 2 * pcap rtc code for Motorola EZX phones 3 * 4 * Copyright (c) 2008 guiming zhuo <gmzhuo@gmail.com> 5 * Copyright (c) 2009 Daniel Ribeiro <drwyrm@gmail.com> 6 * 7 * Based on Motorola's rtc.c Copyright (c) 2003-2005 Motorola 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 * 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/init.h> 18 #include <linux/mfd/ezx-pcap.h> 19 #include <linux/rtc.h> 20 #include <linux/slab.h> 21 #include <linux/platform_device.h> 22 23 struct pcap_rtc { 24 struct pcap_chip *pcap; 25 struct rtc_device *rtc; 26 }; 27 28 static irqreturn_t pcap_rtc_irq(int irq, void *_pcap_rtc) 29 { 30 struct pcap_rtc *pcap_rtc = _pcap_rtc; 31 unsigned long rtc_events; 32 33 if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ)) 34 rtc_events = RTC_IRQF | RTC_UF; 35 else if (irq == pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA)) 36 rtc_events = RTC_IRQF | RTC_AF; 37 else 38 rtc_events = 0; 39 40 rtc_update_irq(pcap_rtc->rtc, 1, rtc_events); 41 return IRQ_HANDLED; 42 } 43 44 static int pcap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) 45 { 46 struct platform_device *pdev = to_platform_device(dev); 47 struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev); 48 struct rtc_time *tm = &alrm->time; 49 unsigned long secs; 50 u32 tod; /* time of day, seconds since midnight */ 51 u32 days; /* days since 1/1/1970 */ 52 53 ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TODA, &tod); 54 secs = tod & PCAP_RTC_TOD_MASK; 55 56 ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, &days); 57 secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY; 58 59 rtc_time_to_tm(secs, tm); 60 61 return 0; 62 } 63 64 static int pcap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) 65 { 66 struct platform_device *pdev = to_platform_device(dev); 67 struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev); 68 struct rtc_time *tm = &alrm->time; 69 unsigned long secs; 70 u32 tod, days; 71 72 rtc_tm_to_time(tm, &secs); 73 74 tod = secs % SEC_PER_DAY; 75 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TODA, tod); 76 77 days = secs / SEC_PER_DAY; 78 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAYA, days); 79 80 return 0; 81 } 82 83 static int pcap_rtc_read_time(struct device *dev, struct rtc_time *tm) 84 { 85 struct platform_device *pdev = to_platform_device(dev); 86 struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev); 87 unsigned long secs; 88 u32 tod, days; 89 90 ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_TOD, &tod); 91 secs = tod & PCAP_RTC_TOD_MASK; 92 93 ezx_pcap_read(pcap_rtc->pcap, PCAP_REG_RTC_DAY, &days); 94 secs += (days & PCAP_RTC_DAY_MASK) * SEC_PER_DAY; 95 96 rtc_time_to_tm(secs, tm); 97 98 return rtc_valid_tm(tm); 99 } 100 101 static int pcap_rtc_set_mmss(struct device *dev, unsigned long secs) 102 { 103 struct platform_device *pdev = to_platform_device(dev); 104 struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev); 105 u32 tod, days; 106 107 tod = secs % SEC_PER_DAY; 108 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_TOD, tod); 109 110 days = secs / SEC_PER_DAY; 111 ezx_pcap_write(pcap_rtc->pcap, PCAP_REG_RTC_DAY, days); 112 113 return 0; 114 } 115 116 static int pcap_rtc_irq_enable(struct device *dev, int pirq, unsigned int en) 117 { 118 struct platform_device *pdev = to_platform_device(dev); 119 struct pcap_rtc *pcap_rtc = platform_get_drvdata(pdev); 120 121 if (en) 122 enable_irq(pcap_to_irq(pcap_rtc->pcap, pirq)); 123 else 124 disable_irq(pcap_to_irq(pcap_rtc->pcap, pirq)); 125 126 return 0; 127 } 128 129 static int pcap_rtc_alarm_irq_enable(struct device *dev, unsigned int en) 130 { 131 return pcap_rtc_irq_enable(dev, PCAP_IRQ_TODA, en); 132 } 133 134 static const struct rtc_class_ops pcap_rtc_ops = { 135 .read_time = pcap_rtc_read_time, 136 .read_alarm = pcap_rtc_read_alarm, 137 .set_alarm = pcap_rtc_set_alarm, 138 .set_mmss = pcap_rtc_set_mmss, 139 .alarm_irq_enable = pcap_rtc_alarm_irq_enable, 140 }; 141 142 static int __init pcap_rtc_probe(struct platform_device *pdev) 143 { 144 struct pcap_rtc *pcap_rtc; 145 int timer_irq, alarm_irq; 146 int err = -ENOMEM; 147 148 pcap_rtc = devm_kzalloc(&pdev->dev, sizeof(struct pcap_rtc), 149 GFP_KERNEL); 150 if (!pcap_rtc) 151 return err; 152 153 pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent); 154 155 platform_set_drvdata(pdev, pcap_rtc); 156 157 pcap_rtc->rtc = devm_rtc_device_register(&pdev->dev, "pcap", 158 &pcap_rtc_ops, THIS_MODULE); 159 if (IS_ERR(pcap_rtc->rtc)) 160 return PTR_ERR(pcap_rtc->rtc); 161 162 timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ); 163 alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA); 164 165 err = devm_request_irq(&pdev->dev, timer_irq, pcap_rtc_irq, 0, 166 "RTC Timer", pcap_rtc); 167 if (err) 168 return err; 169 170 err = devm_request_irq(&pdev->dev, alarm_irq, pcap_rtc_irq, 0, 171 "RTC Alarm", pcap_rtc); 172 if (err) 173 return err; 174 175 return 0; 176 } 177 178 static int __exit pcap_rtc_remove(struct platform_device *pdev) 179 { 180 return 0; 181 } 182 183 static struct platform_driver pcap_rtc_driver = { 184 .remove = __exit_p(pcap_rtc_remove), 185 .driver = { 186 .name = "pcap-rtc", 187 }, 188 }; 189 190 module_platform_driver_probe(pcap_rtc_driver, pcap_rtc_probe); 191 192 MODULE_DESCRIPTION("Motorola pcap rtc driver"); 193 MODULE_AUTHOR("guiming zhuo <gmzhuo@gmail.com>"); 194 MODULE_LICENSE("GPL"); 195